diff options
| author | Kirill A. Shutemov <kirill.shutemov@linux.intel.com> | 2018-02-14 14:16:53 +0300 |
|---|---|---|
| committer | Ingo Molnar <mingo@kernel.org> | 2018-02-14 13:11:14 +0100 |
| commit | c65e774fb3f6af212641538694b9778ff9ab4300 (patch) | |
| tree | 3c4da88dd0658874ea3fc7de3cc96ee27d711ef9 /include/asm-generic | |
| parent | 5c7919bb1994f8dc7fed219a5db09e6bb9d473a5 (diff) | |
x86/mm: Make PGDIR_SHIFT and PTRS_PER_P4D variable
For boot-time switching between 4- and 5-level paging we need to be able
to fold p4d page table level at runtime. It requires variable
PGDIR_SHIFT and PTRS_PER_P4D.
The change doesn't affect the kernel image size much:
text data bss dec hex filename
8628091 4734304 1368064 14730459 e0c4db vmlinux.before
8628393 4734340 1368064 14730797 e0c62d vmlinux.after
Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Cc: Andy Lutomirski <luto@amacapital.net>
Cc: Borislav Petkov <bp@suse.de>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: linux-mm@kvack.org
Link: http://lkml.kernel.org/r/20180214111656.88514-7-kirill.shutemov@linux.intel.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Diffstat (limited to 'include/asm-generic')
| -rw-r--r-- | include/asm-generic/5level-fixup.h | 1 | ||||
| -rw-r--r-- | include/asm-generic/pgtable-nop4d.h | 9 |
2 files changed, 6 insertions, 4 deletions
diff --git a/include/asm-generic/5level-fixup.h b/include/asm-generic/5level-fixup.h index dfbd9d990637..9c2e0708eb82 100644 --- a/include/asm-generic/5level-fixup.h +++ b/include/asm-generic/5level-fixup.h @@ -8,6 +8,7 @@ #define P4D_SHIFT PGDIR_SHIFT #define P4D_SIZE PGDIR_SIZE #define P4D_MASK PGDIR_MASK +#define MAX_PTRS_PER_P4D 1 #define PTRS_PER_P4D 1 #define p4d_t pgd_t diff --git a/include/asm-generic/pgtable-nop4d.h b/include/asm-generic/pgtable-nop4d.h index 8f22f55de17a..1a29b2a0282b 100644 --- a/include/asm-generic/pgtable-nop4d.h +++ b/include/asm-generic/pgtable-nop4d.h @@ -8,10 +8,11 @@ typedef struct { pgd_t pgd; } p4d_t; -#define P4D_SHIFT PGDIR_SHIFT -#define PTRS_PER_P4D 1 -#define P4D_SIZE (1UL << P4D_SHIFT) -#define P4D_MASK (~(P4D_SIZE-1)) +#define P4D_SHIFT PGDIR_SHIFT +#define MAX_PTRS_PER_P4D 1 +#define PTRS_PER_P4D 1 +#define P4D_SIZE (1UL << P4D_SHIFT) +#define P4D_MASK (~(P4D_SIZE-1)) /* * The "pgd_xxx()" functions here are trivial for a folded two-level |